The BETA SPRING (OEM 006.11.158.00.00) is the original Beta Cylinder/Cylinder Head/Valvetrain component for the RR 350 4T, RR 350 4T RACING, RR 390 4T, RR 400 4T, RR 430 4T, RR 430 4T RACING and 4 more models (2013–2016). It keeps your Beta performing exactly as the factory intended. Replace it as part of normal maintenance or after wear.